An Irishman who once stalked celebrities and posed on a dating site as an ordinary guy was exchanging sick messages with security guard Gavin Plumb as he plotted to kidnap rape and murder TV star Holly Willoughby.

Mark Mulligan from Dublin is a convicted stalker who chatted with Plumb as he hatched his plan and together they discussed Willoughby’s kidnap.

Nicola speaks to Niall Donald about Mulligan, Plumb and the chat sites where fantasists can find like minded individuals.

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